On Monday, a new study shed some light on the extent of the law’s effect. University of Wisconsin-Madison political science professor Kenneth Mayer paired with Dane County (Wis.) Clerk Scott McDonell to ask people registered to vote in two counties, Dane and Milwaukee, what kept them from voting in 2016.
The result? Some 16,800 people in the two counties said they didn’t vote because they believed they lacked the proper identification or because they were actually turned away at the polling place. Given margins of error, the number could be as high as 23,000 — about as many votes as Trump’s margin of victory.